@woosh/meep-engine/src/core/math/iabs.js

Pure JavaScript game engine. Fully featured and production ready.

import { assert } from "../assert.js";

/**
 * Branchless fast integer Absolute value function.
 * Same as Math.abs(x) but for integer values only.
 * Only valid for integers up to and including 32 bit.
 * @param {number} x
 * @return {number}
 */
export function iabs(x) {
    // adapted from https://graphics.stanford.edu/~seander/bithacks.html
    assert.isInteger(x, 'x');

    return (x ^ (x >> 31)) - (x >> 31);
}